Guides tagged “troubleshooting”
Step-by-step MdmHost guides about troubleshooting, sorted A-Z.
80 guides · page 1 of 4
"This account has been suspended": why it happens and how to fix it
Understand why a cPanel hosting account shows the 'Account Suspended' page: unpaid invoice, resource abuse, spam or malware, and the steps to get it reactivated.
Access your VPS with the Virtualizor VNC console
Open the browser VNC console in Virtualizor to reach your VPS when SSH fails, use an external VNC client, change the VNC password and fix a blank or frozen console.
Account suspended by MdmHost for abuse or resource use: what to do
Why MdmHost may suspend a reseller customer's account (spam, malware, resource abuse, policy), how to find the reason, fix the cause and get the account unsuspended.
Can't log in to cPanel or WHM? Fixes for every common cause
Get back into cPanel or WHM when the login fails: wrong URL or port, password resets, firewall IP blocks after failed attempts, 2FA problems and suspended accounts.
Can't log in to webmail? Fix cPanel webmail login problems
Solve common cPanel webmail login problems: wrong username format, forgotten mailbox password, blocked port 2096, IP blocks after failed attempts and session errors.
Check that Windows is listening on RDP port 3389
Confirm from inside the server that Remote Desktop is configured for port 3389, the service is running and Windows is actually listening, then fix any mismatch.
CloudLinux memory limit (PMEM) errors: causes and fixes
Fix 500 and 503 errors caused by the CloudLinux physical memory limit: find memory faults, tell them apart from PHP memory_limit errors, and reduce memory use.
Common Docker errors and how to fix them
A quick reference to the Docker and Docker Compose errors you meet most often on a VPS, what each one means and the command that fixes it.
Common email bounce errors explained (550, 552, 554, 421) on cPanel
Understand the bounce messages you receive from cPanel mail servers: user unknown, mailbox full, SPF and DMARC failures, blocklists, rate limits and temporary deferrals.
cPanel cron job not running? Troubleshooting and correct command formats
Fix cron jobs in cPanel that do not run or fail silently: correct PHP paths, absolute file paths, output emails, URL-based crons, timing syntax and logging.
Diagnose network problems with ping, traceroute, nslookup, dig, curl and telnet
A practical toolkit for finding out why a website or server is unreachable: test reachability, the route, DNS answers, ports and HTTP responses.
DirectAdmin website not loading? Troubleshooting checklist
Find why a site on DirectAdmin is down: check DNS, SSL, suspension, default pages, permissions, PHP errors, .htaccess, quotas and server services in order.
Domain not resolving? Troubleshoot DNS step by step
Fix DNS_PROBE_FINISHED_NXDOMAIN and "server IP address could not be found" by checking registration, nameservers, A records, propagation and local DNS cache.
Email not sending from cPanel? How to find and fix the cause
Work out why mail will not send from your cPanel mailbox or website: SMTP settings, ports, authentication, sending limits, blocklists and PHP mail from WordPress.
Enable WordPress debug mode and read the debug log
Turn on WP_DEBUG safely to find the plugin or theme behind an error: log to a private file, read debug.log, check PHP error logs in cPanel and switch it off.
Event Viewer basics on Windows Server
Use Event Viewer on your Windows Server VPS to find errors, unexpected reboots, failed RDP logins and crashing apps, with filters, custom views and useful event IDs.
File upload blocked or deleted by Imunify360? Here is why
Why Imunify360 blocks or removes files right after upload via FTP, File Manager or WordPress, how to confirm it was a malware detection, and what to do next.
Find and fix a WordPress plugin conflict
Track down the plugin or theme behind a WordPress problem with Health Check troubleshooting mode, the half-split method, logs and browser console checks.
Find and fix PHP errors using error_log on cPanel hosting
Locate PHP errors in error_log files and cPanel Errors, read fatal errors and warnings correctly, enable safe debugging and fix the most common PHP messages.
Find website errors with the Plesk Log Browser
Use the Plesk Log Browser to read Apache, Nginx and PHP error logs, filter by status code, watch logs in real time and diagnose 500, 502, 503 and 404 errors.
Browse by topic
- Getting startedYour first hour with a new server: access, logins and basics.69 guides
- cPanelFiles, databases, email, domains and every cPanel tool, step by step.37 guides
- WHM & resellingWHM, packages, reseller accounts, WHMReseller and running a hosting brand.49 guides
- WordPressInstall, secure, speed up, migrate and fix WordPress sites.40 guides
- Email & webmailMailboxes, webmail, forwarders, spam filters and email delivery.37 guides
- DomainsRegistering, transferring and managing domains and nameservers.20 guides
- SSL certificatesFree AutoSSL, Let's Encrypt, paid certificates and HTTPS.19 guides
- CloudLinuxCloudLinux setup and use: LVE limits, CloudLinux Manager, CageFS and PHP/Node.js selectors.31 guides
- LiteSpeedLiteSpeed Web Server, LSCache and the LiteSpeed Cache plugin: install, settings and tuning.30 guides
- Imunify360Malware scanning, firewall and proactive defence with Imunify360.23 guides
- SoftaculousInstall, update, clone and back up apps with Softaculous.23 guides
- WP SquaredcPanel's WordPress platform: sites, plugins, staging and backups.9 guides
- SitePadBuild and publish websites with the SitePad builder.9 guides
- SitejetDesign, edit and publish sites with the Sitejet builder.9 guides
- WHMResellerAlpha and master resellers with WHMReseller: install, setup and use.12 guides
- VirtFusionInstall, set up and manage VirtFusion: hypervisors, packages, servers and WHMCS integration.7 guides
- VirtualizorManage your VPS with Virtualizor: power, OS reinstall, VNC, IPs and backups.30 guides
- PleskWebsites, email, databases and settings in the Plesk panel.52 guides
- DirectAdminUsers, domains, email and reseller tools in DirectAdmin.40 guides
- WHMCSBilling, automation, products and client management with WHMCS.51 guides
- Control panelscPanel & WHM, Plesk, DirectAdmin and other panels on your VPS.106 guides
- SecurityKeys, passwords, firewalls and keeping a server patched.115 guides
- Networking & DNSIP addresses, reverse DNS, ports and traffic.34 guides
- Websites & appsWeb servers, WordPress, PHP, Node.js, SSL and app hosting.52 guides
- DatabasesMySQL, MariaDB, PostgreSQL, Redis and MongoDB on a VPS.64 guides
- Billing & accountInvoices, renewals, the client area and your account.9 guides
- TroubleshootingWhen something is not working: checks and fixes.68 guides
- Linux VPSSSH, packages, services and everyday Linux administration.70 guides
- Windows VPS & RDPRemote Desktop, Windows Server settings and Admin RDP tips.58 guides
- Docker & DevOpsContainers, Git deploys, automation, monitoring and backups.58 guides
Still stuck?
Ask MdmHost AI for a quick answer, or open a ticket and our team will take a look. We are here 24/7.